/Engine/Source/Runtime/Experimental/Chaos/Public/PhysicsProxy/ClusterUnionPhysicsProxy.h
Set GT geometry - this is only for smoothing over any changes until the PT syncs back to the GT.
void SetSharedGeometry_External ( const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [Chaos::FImplicitObject](API\Runtime\Chaos\Chaos\FImplicitObject), ESPMode::ThreadSafe > & Geometry, const [TArray](API\Runtime\Core\Containers\TArray)< [FPBDRigidParticle](API\Runtime\Chaos\Chaos\FPBDRigidParticle) * > & ShapeParticles )